Question 1

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 2

A sample of lead (Pb) has a mass of 22.7 g and a volume of 2.0 cm$$^3. $$What is the density of the sample?

Accepted Answer

$$11.35\ \mathrm{g/cm^3$}$$

Question 3

Which statement best describes a compound?

Accepted Answer

It contains two or more different types of atoms chemically bonded together.

Question 4

Which separation technique would be most effective for separating a mixture of iron filings and sand?

Accepted Answer

Magnet

Question 5

A 550 g sample of chromium(III) oxide ($$\mathrm{Cr_2O_3}) $$contains 376 g of Cr. How many grams of Cr are in a 212 g sample of $$\mathrm{Cr_2O_3}$$?

Accepted Answer

$$145\ \mathrm{g}$$

Question 6

Which of the following is a physical change?

Accepted Answer

Boiling water

Question 7

How many atoms are in 0.68 moles of zinc?

Accepted Answer

$$4.10 	imes 10$$^{23}$$

Question 8

Which of the following is a homogeneous mixture?

Accepted Answer

Bronze

Question 9

Which process is exothermic?

Accepted Answer

Water freezing

Question 10

A rectangular solid has edge lengths of 8.2 cm, 5.1 cm, and 4.7 cm. What is its volume?

Accepted Answer

$$196.8\ \mathrm{cm^3$}$$

Question 11

Which of the following is a chemical property?

Accepted Answer

Reactivity with water

Question 12

How many moles are in $$3.79 	imes 10$$^{23}$$ atoms of zinc?

Accepted Answer

$$0.63$$

Question 13

Which statement about elements and compounds is correct?

Accepted Answer

Compounds have properties different from their constituent elements.

Question 14

A sample of butane ($$\mathrm{C_4H_{10}}) $$contains 288 g carbon and 60 g hydrogen. What is the total mass of the sample?

Accepted Answer

$$348\ \mathrm{g}$$

Question 15

Which of the following is an example of a diatomic element?

Accepted Answer

O$$_2$$

Question 16

Which of the following is an example of an allotrope?

Accepted Answer

Diamond and graphite (forms of carbon)

Question 17

Which of the following best describes a heterogeneous mixture?

Accepted Answer

It has different composition and properties in the same sample.

Question 18

The Law of Conservation of Energy states that:

Accepted Answer

Energy cannot be created or destroyed, only transformed.

Question 19

How many grams are in $$2.65 	imes 10$$^{23}$$ atoms of neon? (Molar mass of Ne = 20.18 g/mol)

Accepted Answer

$$8.89\ \mathrm{g}$$

Question 20

Which of the following is NOT a method for separating mixtures by physical means?

Accepted Answer

Electrolysis

Fundamental Concepts in General Chemistry: Matter, Classification, Properties, and the Mole

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